Compiler #if directive to split between Mono and .NET [duplicate]

Answer 1

Preferred way is to use runtime detection, as this allows for the same assemblies to be used on either platform:

using System;

class Program {
    static void Main ()
    {
        Type t = Type.GetType ("Mono.Runtime");
        if (t != null)
             Console.WriteLine ("You are running with the Mono VM");
        else
             Console.WriteLine ("You are running something else");
    }
}